Optical imaging lens

ABSTRACT

The present invention provides an optical imaging lens. The optical imaging lens comprises eight lens elements positioned in an order from an object side to an image side. Through controlling the convex or concave shape of the surfaces of the lens elements, the optical imaging lens may be provided with shortened system length, reduced f number, and increased image height, along with good imaging quality.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to P.R.C. Patent Application No.202011425841.9 titled “Optical Imaging Lens,” filed on Dec. 9, 2020,with the State Intellectual Property Office (SIPO) of the People'sRepublic of China.

TECHNICAL FIELD

The present disclosure relates to optical imaging lenses, andparticularly, optical imaging lenses of portable electronic devices.

BACKGROUND

Recently, application of optical imaging lenses expands along with thecontinuous evolvement of the optical imaging lenses. Slim and compactappearance, small Fno for increasing luminous flux, and great field ofview are the trends in the industry. To provide for great pixels andhigh resolution, an imaging height must be increased to adopt an imagesensor with great sizes receiving imaging rays. Therefore, how to designan optical imaging lens with slim and compact appearance, small Fno,great field of view, great imaging height and good imaging quality is akey topic to research.

SUMMARY

The present disclosure provides for optical imaging lenses shorteningsystem length, decreasing f-number and enlarging image height in view ofachieving good imaging quality.

In an example embodiment, an optical imaging lens may comprise eightlens elements, hereinafter referred to as first, second, third, fourth,fifth, sixth, seventh and eighth lens element and positionedsequentially from an object side to an image side along an optical axis.Each of the first, second, third, fourth, fifth, sixth, seventh andeighth lens element may also have an object-side surface facing towardthe object side and allowing imaging rays to pass through and animage-side surface facing toward the image side and allowing the imagingrays to pass through.

In the specification, parameters used here are defined as follows. Athickness of the first lens element along the optical axis isrepresented by T1. A distance from the image-side surface of the firstlens element to the object-side surface of the second lens element alongthe optical axis, i.e. an air gap between the first lens element and thesecond lens element along the optical axis, is represented by G12. Athickness of the second lens element along the optical axis isrepresented by T2. A distance from the image-side surface of the secondlens element to the object-side surface of the third lens element alongthe optical axis, i.e. an air gap between the second lens element andthe third lens element along the optical axis, is represented by G23. Athickness of the third lens element along the optical axis isrepresented by T3. A distance from the image-side surface of the thirdlens element to the object-side surface of the fourth lens element alongthe optical axis, i.e. an air gap between the third lens element and thefourth lens element along the optical axis, is represented by G34. Athickness of the fourth lens element along the optical axis isrepresented by T4. A distance from the image-side surface of the fourthlens element to the object-side surface of the fifth lens element alongthe optical axis, i.e. an air gap between the fourth lens element andthe fifth lens element along the optical axis, is represented by G45. Athickness of the fifth lens element along the optical axis isrepresented by T5. A distance from the image-side surface of the fifthlens element to the object-side surface of the sixth lens element alongthe optical axis, i.e. an air gap between the fifth lens element and thesixth lens element along the optical axis, is represented by G56. Athickness of the sixth lens element along the optical axis isrepresented by T6. A distance from the image-side surface of the sixthlens element to the object-side surface of the seventh lens elementalong the optical axis, i.e. an air gap between the sixth lens elementand the seventh lens element along the optical axis, is represented byG67. A thickness of the seventh lens element along the optical axis isrepresented by T7. A distance from the image-side surface of the seventhlens element to the object-side surface of the eighth lens element alongthe optical axis, i.e. an air gap between the seventh lens element andthe eighth lens element along the optical axis, is represented by G78. Athickness of the eighth lens element along the optical axis isrepresented by T8. A distance from the image-side surface of the eighthlens element to an object-side surface of a filtering unit along theoptical axis is represented by G8F. A thickness of the filtering unitalong the optical axis is represented by TTF. A distance from theimage-side surface of the filtering unit to the image plane along theoptical axis is represented by GFP. A focal length of the first lenselement is represented by f1. A focal length of the second lens elementis represented by f2. A focal length of the third lens element isrepresented by f3. A focal length of the fourth lens element isrepresented by f4. A focal length of the fifth lens element isrepresented by f5. A focal length of the sixth lens element isrepresented by f6. A focal length of the seventh lens element isrepresented by f7. A focal length of the eighth lens element isrepresented by f8. A refractive index of the first lens element isrepresented by n1. A refractive index of the second lens element isrepresented by n2. A refractive index of the third lens element isrepresented by n3. A refractive index of the fourth lens element isrepresented by n4. A refractive index of the fifth lens element isrepresented by n5. A refractive index of the sixth lens element isrepresented by n6. A refractive index of the seventh lens element isrepresented by n7. A refractive index of the eighth lens element isrepresented by n8. An abbe number of the first lens element isrepresented by V1. An abbe number of the second lens element isrepresented by V2. An abbe number of the third lens element isrepresented by V3. An abbe number of the fourth lens element isrepresented by V4. An abbe number of the fifth lens element isrepresented by V5. An abbe number of the sixth lens element isrepresented by V6. An abbe number of the seventh lens element isrepresented by V7. An abbe number of the eighth lens element isrepresented by V8. An effective focal length of the optical imaging lensis represented by EFL. A distance from the object-side surface of thefirst lens element to the image-side surface of the eighth lens elementalong the optical axis is represented by TL. A distance from theobject-side surface of the first lens element to the image plane alongthe optical axis, i.e. a system length, is represented by TTL. A sum ofthe thicknesses of all eight lens elements from the first lens elementto the eighth lens element along the optical axis, i.e. a sum of T1, T2,T3, T4, T5, T6, T7 and T8, is represented by ALT. A sum of seven airgaps from the first lens element to the eighth lens element along theoptical axis, i.e. a sum of G12, G23, G34, G45, G56, G67 and G78, isrepresented by AAG. A distance from the image-side surface of the eighthlens element to the image plane along the optical axis i.e. a sum ofG8F, TTF and GFP, is represented by BFL. A half field of view of theoptical imaging lens is represented by HFOV. An image height of theoptical imaging lens is represented by ImgH. A f-number of the opticalimaging lens is represented by Fno. A distance from the object-sidesurface of the second lens element to the image-side surface of thefifth lens element along the optical axis, i.e. a sum of T2, G23, T3,G34, T4, G45 and T5, is represented by D25. A distance from theobject-side surface of the seventh lens element to the image-sidesurface of the eighth lens element along the optical axis, i.e. a sum ofT7, G78 and T8, is represented by D78.

In an aspect of the present disclosure, in the optical imaging lens, thefirst lens element has positive refracting power, the fifth lens elementhas negative refracting power, and an optical axis region of theimage-side surface of the fifth lens element is convex, and the sixthlens element has positive refracting power. Lens elements included bythe optical imaging lens are only the eight lens elements describedabove, and the optical imaging lens satisfies the inequalities:

V5+V6+V7≥155.000  Inequality (1).

In another aspect of the present disclosure, in the optical imaginglens, the first lens element has positive refracting power, a peripheryregion of the object-side surface of the second lens element is convex,the fifth lens element has negative refracting power, the sixth lenselement has positive refracting power, and an optical axis region of theobject-side surface of the seventh lens element is convex. Lens elementsincluded by the optical imaging lens are only the eight lens elementsdescribed above, and the optical imaging lens satisfies Inequality (1).

In another aspect of the present disclosure, in the optical imaginglens, the third lens element has positive refracting power, the fifthlens element has negative refracting power, the sixth lens element haspositive refracting power, and an optical axis region of the image-sidesurface of the sixth lens element is concave, and an optical axis regionof the object-side surface of the seventh lens element is convex. Lenselements included by the optical imaging lens are only the eight lenselements described above, and the optical imaging lens satisfies:

V5+V6≥85.000  Inequality (2).

In another example embodiment, other inequality(s), such as thoserelating to the ratio among parameters could be taken intoconsideration. For example:

ImgH/(T3+T4)≥7.500  Inequality (3);

AAG/BFL≥1.800  Inequality (4);

TTL/(T2+G45+G67)≥7.200  Inequality (5);

TL/T1≤13.000  Inequality (6);

(T1+T2+T3+T4)/D78≤1.000  Inequality (7);

(T5+T8)/G34≤5.600  Inequality (8);

ImgH/(T5+G56)≥6.700  Inequality (9);

EFL/BFL≥5.300  Inequality (10);

TTL/T8≤18.000  Inequality (11);

(G67+T7+G78)/T1≤4.100  Inequality (12);

D25/(T1+G12)≤5.000  Inequality (13);

ALT/AAG≤1.900  Inequality (14);

ImgH/(T2+G45)≥10.000  Inequality (15);

(EFL+BFL)/(T5+G56)≤11.400  Inequality (16);

TL/(G12+T4)≥13.000  Inequality (17);

(G34+T5)/T6≥1.500  Inequality (18);

(T4+G67)/G23≤4.500  Inequality (19);

(EFL+ImgH)/ALT≥2.600  Inequality (20);

(V6+V7)−(V2+V4)≥30.000  Inequality (21);

(V7+V8)−(V4+V6)≥20.000  Inequality (22);

|V6−V7|≥20.000  Inequality (23);

V6-V2≥10.000  Inequality (24); and/or

V7−V4≥20.000  Inequality (25).

In some example embodiments, more details about the convex or concavesurface structure, refracting power or chosen material etc. could beincorporated for one specific lens element or broadly for a plurality oflens elements to improve the control for the system performance and/orresolution. It is noted that the details listed herein could beincorporated in example embodiments if no inconsistency occurs.

The optical imaging lens in example embodiments may shorten systemlength, decrease f-number and increase image height in view of achievinggood imaging quality.

BRIEF DESCRIPTION OF THE DRAWINGS

Example embodiments will be more readily understood from the followingdetailed description when read in conjunction with the appended drawing,in which:

FIG. 1 depicts a cross-sectional view of one single lens elementaccording to the present disclosure;

FIG. 2 depicts a cross-sectional view showing the relation between theshape of a portion and the position where a collimated ray meets theoptical axis;

FIG. 3 depicts a cross-sectional view showing a first example ofdetermining the shape of lens element regions and the boundaries ofregions;

FIG. 4 depicts a cross-sectional view showing a second example ofdetermining the shape of lens element regions and the boundaries ofregions;

FIG. 5 depicts a cross-sectional view showing a third example ofdetermining the shape of lens element regions and the boundaries ofregions;

FIG. 6 depicts a cross-sectional view of a first embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIGS. 7A-7D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of a first embodiment of the opticalimaging lens according to the present disclosure;

FIG. 8 depicts a table of optical data for each lens element of a firstembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 9 depicts a table of aspherical data of a first embodiment of theoptical imaging lens according to the present disclosure;

FIG. 10 depicts a cross-sectional view of a second embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIGS. 11A-11D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of a second embodiment of the opticalimaging lens according to the present disclosure;

FIG. 12 depicts a table of optical data for each lens element of theoptical imaging lens of a second embodiment of the present disclosure;

FIG. 13 depicts a table of aspherical data of a second embodiment of theoptical imaging lens according to the present disclosure;

FIG. 14 depicts a cross-sectional view of a third embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIGS. 15A-15D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of a third embodiment of the opticalimaging lens according to the present disclosure;

FIG. 16 depicts a table of optical data for each lens element of theoptical imaging lens of a third embodiment of the present disclosure;

FIG. 17 depicts a table of aspherical data of a third embodiment of theoptical imaging lens according to the present disclosure;

FIG. 18 depicts a cross-sectional view of a fourth embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIGS. 19A-19D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of a fourth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 20 depicts a table of optical data for each lens element of theoptical imaging lens of a fourth embodiment of the present disclosure;

FIG. 21 depicts a table of aspherical data of a fourth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 22 depicts a cross-sectional view of a fifth embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIGS. 23A-23D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of a fifth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 24 depicts a table of optical data for each lens element of theoptical imaging lens of a fifth embodiment of the present disclosure;

FIG. 25 depicts a table of aspherical data of a fifth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 26 depicts a cross-sectional view of a sixth embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIGS. 27A-27D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of a sixth embodiment of the opticalimaging lens according the present disclosure;

FIG. 28 depicts a table of optical data for each lens element of theoptical imaging lens of a sixth embodiment of the present disclosure;

FIG. 29 depicts a table of aspherical data of a sixth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 30 depicts a cross-sectional view of a seventh embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIGS. 31A-31D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of a seventh embodiment of theoptical imaging lens according to the present disclosure;

FIG. 32 depicts a table of optical data for each lens element of aseventh embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 33 depicts a table of aspherical data of a seventh embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 34 depicts a cross-sectional view of an eighth embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIGS. 35A-35D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of an eighth embodiment of theoptical imaging lens according to the present disclosure;

FIG. 36 depicts a table of optical data for each lens element of aneighth embodiment of an optical imaging lens according to the presentdisclosure;

FIG. 37 depicts a table of aspherical data of an eighth embodiment ofthe optical imaging lens according to the present disclosure;

FIG. 38 depicts a cross-sectional view of a ninth embodiment of anoptical imaging lens having eight lens elements according to the presentdisclosure;

FIGS. 39A-39D depict charts of a longitudinal spherical aberration andother kinds of optical aberrations of a ninth embodiment of the opticalimaging lens according to the present disclosure;

FIG. 40 depicts a table of optical data for each lens element of a ninthembodiment of an optical imaging lens according to the presentdisclosure;

FIG. 41 depicts a table of aspherical data of a ninth embodiment of theoptical imaging lens according to the present disclosure;

FIGS. 42 and 43 depict a table for the values of V5+V6+V7, V5+V6,ImgH/(T3+T4), AAG/BFL, TTL/(T2+G45+G67), TL/T1, (T1+T2+T3+T4)/D78,(T5+T8)/G34, ImgH/(T5+G56), EFL/BFL, TTL/T8, (G67+T7+G78)/T1,D25/(T1+G12), ALT/AAG, ImgH/(T2+G45), (EFL+BFL)/(T5+G56), TL/(G12+T4),(G34+T5)/T6, (T4+G67)/G23, (EFL+ImgH)/ALT, (V6+V7)−(V2+V4),(V7+V8)−(V4+V6), |V6−V7|, V6−V2 and V7−V4 of all nine exampleembodiments.

DETAILED DESCRIPTION

For a more complete understanding of the present disclosure and itsadvantages, reference is now made to the following description taken inconjunction with the accompanying drawings, in which like referencenumbers indicate like features. Persons of ordinary skill in the arthaving the benefit of the present disclosure will understand othervariations for implementing embodiments within the scope of the presentdisclosure, including those specific examples described herein. Thedrawings are not limited to specific scale and similar reference numbersare used for representing similar elements. As used in the disclosuresand the appended claims, the terms “example embodiment,” “exemplaryembodiment,” and “present embodiment” do not necessarily refer to asingle embodiment, although it may, and various example embodiments maybe readily combined and interchanged, without departing from the scopeor spirit of the present disclosure. Furthermore, the terminology asused herein is for the purpose of describing example embodiments onlyand is not intended to be a limitation of the disclosure. In thisrespect, as used herein, the term “in” may include “in” and “on”, andthe terms “a”, “an” and “the” may include singular and pluralreferences. Furthermore, as used herein, the term “by” may also mean“from”, depending on the context. Furthermore, as used herein, the term“if” may also mean “when” or “upon”, depending on the context.Furthermore, as used herein, the words “and/or” may refer to andencompass any and all possible combinations of one or more of theassociated listed items.

The terms “optical axis region”, “periphery region”, “concave”, and“convex” used in this specification and claims should be interpretedbased on the definition listed in the specification by the principle oflexicographer.

In the present disclosure, the optical system may comprise at least onelens element to receive imaging rays that are incident on the opticalsystem over a set of angles ranging from parallel to an optical axis toa half field of view (HFOV) angle with respect to the optical axis. Theimaging rays pass through the optical system to produce an image on animage plane. The term “a lens element having positive refracting power(or negative refracting power)” means that the paraxial refracting powerof the lens element in Gaussian optics is positive (or negative). Theterm “an object-side (or image-side) surface of a lens element” refersto a specific region of that surface of the lens element at whichimaging rays can pass through that specific region. Imaging rays includeat least two types of rays: a chief ray Lc and a marginal ray Lm (asshown in FIG. 1). An object-side (or image-side) surface of a lenselement can be characterized as having several regions, including anoptical axis region, a periphery region, and, in some cases, one or moreintermediate regions, as discussed more fully below.

FIG. 1 is a radial cross-sectional view of a lens element 100. Tworeferential points for the surfaces of the lens element 100 can bedefined: a central point, and a transition point. The central point of asurface of a lens element is a point of intersection of that surface andthe optical axis I. As illustrated in FIG. 1, a first central point CP1may be present on the object-side surface 110 of lens element 100 and asecond central point CP2 may be present on the image-side surface 120 ofthe lens element 100. The transition point is a point on a surface of alens element, at which the line tangent to that point is perpendicularto the optical axis I. The optical boundary OB of a surface of the lenselement is defined as a point at which the radially outermost marginalray Lm passing through the surface of the lens element intersects thesurface of the lens element. All transition points lie between theoptical axis I and the optical boundary OB of the surface of the lenselement. A surface of the lens element 100 may have no transition pointor have at least one transition point. If multiple transition points arepresent on a single surface, then these transition points aresequentially named along the radial direction of the surface withreference numerals starting from the first transition point. Forexample, the first transition point, e.g., TP1, (closest to the opticalaxis I), the second transition point, e.g., TP2, (as shown in FIG. 4),and the Nth transition point (farthest from the optical axis I).

When a surface of the lens element has at least one transition point,the region of the surface of the lens element from the central point tothe first transition point TP1 is defined as the optical axis region,which includes the central point. The region located radially outside ofthe farthest transition point (the Nth transition point) from theoptical axis I to the optical boundary OB of the surface of the lenselement is defined as the periphery region. In some embodiments, theremay be intermediate regions present between the optical axis region andthe periphery region, with the number of intermediate regions dependingon the number of the transition points. When a surface of the lenselement has no transition point, the optical axis region is defined as aregion of 0%-50% of the distance between the optical axis I and theoptical boundary OB of the surface of the lens element, and theperiphery region is defined as a region of 50%-100% of the distancebetween the optical axis I and the optical boundary OB of the surface ofthe lens element.

The shape of a region is convex if a collimated ray being parallel tothe optical axis I and passing through the region is bent toward theoptical axis I such that the ray intersects the optical axis I on theimage side A2 of the lens element. The shape of a region is concave ifthe extension line of a collimated ray being parallel to the opticalaxis I and passing through the region intersects the optical axis I onthe object side A1 of the lens element.

Additionally, referring to FIG. 1, the lens element 100 may also have amounting portion 130 extending radially outward from the opticalboundary OB. The mounting portion 130 is typically used to physicallysecure the lens element to a corresponding element of the optical system(not shown). Imaging rays do not reach the mounting portion 130. Thestructure and shape of the mounting portion 130 are only examples toexplain the technologies, and should not be taken as limiting the scopeof the present disclosure. The mounting portion 130 of the lens elementsdiscussed below may be partially or completely omitted in the followingdrawings.

Referring to FIG. 2, optical axis region Z1 is defined between centralpoint CP and first transition point TP1. Periphery region Z2 is definedbetween TP1 and the optical boundary OB of the surface of the lenselement. Collimated ray 211 intersects the optical axis I on the imageside A2 of lens element 200 after passing through optical axis regionZ1, i.e., the focal point of collimated ray 211 after passing throughoptical axis region Z1 is on the image side A2 of the lens element 200at point R in FIG. 2. Accordingly, since the ray itself intersects theoptical axis I on the image side A2 of the lens element 200, opticalaxis region Z1 is convex. On the contrary, collimated ray 212 divergesafter passing through periphery region Z2. The extension line EL ofcollimated ray 212 after passing through periphery region Z2 intersectsthe optical axis I on the object side A1 of lens element 200, i.e., thefocal point of collimated ray 212 after passing through periphery regionZ2 is on the object side A1 at point M in FIG. 2. Accordingly, since theextension line EL of the ray intersects the optical axis I on the objectside A1 of the lens element 200, periphery region Z2 is concave. In thelens element 200 illustrated in FIG. 2, the first transition point TP1is the border of the optical axis region and the periphery region, i.e.,TP1 is the point at which the shape changes from convex to concave.

Alternatively, there is another way for a person having ordinary skillin the art to determine whether an optical axis region is convex orconcave by referring to the sign of “Radius of curvature” (the “R”value), which is the paraxial radius of shape of a lens surface in theoptical axis region. The R value is commonly used in conventionaloptical design software such as Zemax and CodeV. The R value usuallyappears in the lens data sheet in the software. For an object-sidesurface, a positive R value defines that the optical axis region of theobject-side surface is convex, and a negative R value defines that theoptical axis region of the object-side surface is concave. Conversely,for an image-side surface, a positive R value defines that the opticalaxis region of the image-side surface is concave, and a negative R valuedefines that the optical axis region of the image-side surface isconvex. The result found by using this method should be consistent withthe method utilizing intersection of the optical axis by rays/extensionlines mentioned above, which determines surface shape by referring towhether the focal point of a collimated ray being parallel to theoptical axis I is on the object-side or the image-side of a lenselement. As used herein, the terms “a shape of a region is convex(concave),” “a region is convex (concave),” and “a convex-(concave-)region,” can be used alternatively.

FIG. 3, FIG. 4 and FIG. 5 illustrate examples of determining the shapeof lens element regions and the boundaries of regions under variouscircumstances, including the optical axis region, the periphery region,and intermediate regions as set forth in the present specification.

FIG. 3 is a radial cross-sectional view of a lens element 300. Asillustrated in FIG. 3, only one transition point TP1 appears within theoptical boundary OB of the image-side surface 320 of the lens element300. Optical axis region Z1 and periphery region Z2 of the image-sidesurface 320 of lens element 300 are illustrated. The R value of theimage-side surface 320 is positive (i.e., R>0). Accordingly, the opticalaxis region Z1 is concave.

In general, the shape of each region demarcated by the transition pointwill have an opposite shape to the shape of the adjacent region(s).Accordingly, the transition point will define a transition in shape,changing from concave to convex at the transition point or changing fromconvex to concave. In FIG. 3, since the shape of the optical axis regionZ1 is concave, the shape of the periphery region Z2 will be convex asthe shape changes at the transition point TP1.

FIG. 4 is a radial cross-sectional view of a lens element 400. Referringto FIG. 4, a first transition point TP1 and a second transition pointTP2 are present on the object-side surface 410 of lens element 400. Theoptical axis region Z1 of the object-side surface 410 is defined betweenthe optical axis I and the first transition point TP1. The R value ofthe object-side surface 410 is positive (i.e., R>0). Accordingly, theoptical axis region Z1 is convex.

The periphery region Z2 of the object-side surface 410, which is alsoconvex, is defined between the second transition point TP2 and theoptical boundary OB of the object-side surface 410 of the lens element400. Further, intermediate region Z3 of the object-side surface 410,which is concave, is defined between the first transition point TP1 andthe second transition point TP2. Referring once again to FIG. 4, theobject-side surface 410 includes an optical axis region Z1 locatedbetween the optical axis I and the first transition point TP1, anintermediate region Z3 located between the first transition point TP1and the second transition point TP2, and a periphery region Z2 locatedbetween the second transition point TP2 and the optical boundary OB ofthe object-side surface 410. Since the shape of the optical axis regionZ1 is designed to be convex, the shape of the intermediate region Z3 isconcave as the shape of the intermediate region Z3 changes at the firsttransition point TP1, and the shape of the periphery region Z2 is convexas the shape of the periphery region Z2 changes at the second transitionpoint TP2.

FIG. 5 is a radial cross-sectional view of a lens element 500. Lenselement 500 has no transition point on the object-side surface 510 ofthe lens element 500. For a surface of a lens element with no transitionpoint, for example, the object-side surface 510 the lens element 500,the optical axis region Z1 is defined as the region of 0%-50% of thedistance between the optical axis I and the optical boundary OB of thesurface of the lens element and the periphery region is defined as theregion of 50%-100% of the distance between the optical axis I and theoptical boundary OB of the surface of the lens element. Referring tolens element 500 illustrated in FIG. 5, the optical axis region Z1 ofthe object-side surface 510 is defined between the optical axis I and50% of the distance between the optical axis I and the optical boundaryOB. The R value of the object-side surface 510 is positive (i.e., R>0).Accordingly, the optical axis region Z1 is convex. For the object-sidesurface 510 of the lens element 500, because there is no transitionpoint, the periphery region Z2 of the object-side surface 510 is alsoconvex. It should be noted that lens element 500 may have a mountingportion (not shown) extending radially outward from the periphery regionZ2.

In the present disclosure, examples of an optical imaging lens areprovided. Example embodiments of an optical imaging lens may comprise afirst lens element, a second lens element, a third lens element, afourth lens element, a fifth lens element, a sixth lens element, aseventh lens element and an eighth lens element arranged sequentiallyfrom the object side to the image side along an optical axis. Each ofthe lens elements may comprise an object-side surface facing toward anobject side allowing imaging rays to pass through and an image-sidesurface facing toward an image side allowing the imaging rays to passthrough. Through controlling shape of the surfaces and range of theparameters, the optical imaging lens in example embodiments may shortensystem length, decrease f-number and increase image height of theoptical imaging lens in view of achieving good imaging quality.

In some embodiments, the lens elements are designed with convex/concavesurface shape and refracting power of lens elements in light of theoptical characteristics and system length. For example, when an opticalimaging lens satisfies conditions that the first lens element haspositive refracting power, the fifth lens element has negativerefracting power, the sixth lens element has positive refracting power,and V5+V6+V7≥155.000, accompanied with one of the combinations below:(a) an optical axis region of the image-side surface of the fifth lenselement is convex; (b) a periphery region of the object-side surface ofthe second lens element is convex, and an optical axis region of theobject-side surface of the seventh lens element is convex, it will bebeneficial to increase luminous flux, increase image height and improvechromatic aberration to provide good imaging quality.

When an optical imaging lens satisfies the conditions that the thirdlens element has positive refracting power, the fifth lens element hasnegative refracting power, the sixth lens element has positiverefracting power, an optical axis region of the image-side surface ofthe sixth lens element is concave, and an optical axis region of theobject-side surface of the seventh lens element is convex, it will bebeneficial to increase luminous flux, increase image height and providegood imaging quality. When the optical imaging lens further satisfiesV5+V6≥85.000, it will be beneficial to adjust chromatic aberration andother aberrations. Preferably, the optical imaging lens furthersatisfies 85.000≤V5+V6≤125.000.

In an optical imaging lens, when the fifth, sixth or seventh lenselement is made by plastic materials, the shape of aspherical surfacewill be formed well. Under such circumstances, better manufacturingyield may be shown even when the surface shapes of an optical axisregion and a periphery region are different.

When the material of the lens elements satisfies the condition that theabbe number of the fifth and eighth are of the same value,(V6+V7)−(V2+V4)≥30.000, (V7+V8)−(V4+V6)≥20.000, |V6−V7|≤20.000,V6−V2≥10.000 or V7−V4≥20.000, it will be beneficial to transmit anddeflect imaging rays and eliminate chromatic aberration effectively toprovide good imaging quality. Preferably, the optical imaging lensfurther satisfies 30.000≤(V6+V7)−(V2+V4)≤75.000,20.000≤(V7+V8)−(V4+V6)≤60.000, 0.000≤|V6−V7|≤20.000, 10.000V6−V2≤40.000, 20.000≤V7−V4≤40.000.

When the image height (ImgH) of the optical imaging lens satisfies thecondition that ImgH/(T3+T4)≥7.500, ImgH/(T5+G56)≥6.700,ImgH/(T2+G45)≥10.000 or (EFL+ImgH)/ALT≥22.600, the image height may beincreased, and the pixels and resolution may be raised. Preferably, theoptical imaging lens further satisfies 7.500≤ImgH/(T3+T4)≤11.700,6.700≤ImgH/(T5+G56)≤10.300, 10.000≤ImgH/(T2+G45)≤24.800,2.600≤(EFL+ImgH)/ALT≤3.700.

When the optical imaging lens further satisfies at least one of theinequalities listed below, the thickness of each lens element and airgap between lens elements may be sustained proper values to avoid anyexcessive value which may be unfavorable to shorten system length andany insufficient value which may increase the production or assemblydifficulty:

AAG/BFL≥21.800, and preferably, 1.800≤AAG/BFL≤3.700;

TTL/(T2+G45+G67)≥7.200, and preferably, 7.200≤TTL/(T2+G45+G67)≤14.000;

TL/T1≤13.000, and preferably, 5.200≤TL/T1≤13.000;

(T1+T2+T3+T4)/D78≤1.000, and preferably, 0.500≤(T1+T2+T3+T4)/D78≤1.000;

(T5+T8)/G34≤5.600, and preferably, 1.200≤(T5+T8)/G34≤5.600;

EFL/BFL≥5.300, and preferably, 5.300≤EFL/BFL≤6.900;

TTL/T8≤18.000, and preferably, 6.400≤TTL/T8≤18.000;

(G67+T7+G78)/T1≤4.100, and preferably, 1.200(G67+T7+G78)/T1≤4.100;

D25/(T1+G12)≤5.000, and preferably, 1.500≤D25/(T1+G12)≤5.000;

ALT/AAG≤1.900, and preferably, 1.000≤ALT/AAG≤1.900;

(EFL+BFL)/(T5+G56)≤11.400, and preferably,6.400≤(EFL+BFL)/(T5+G56)≤11.400;

TL/(G12+T4)≥13.000, and preferably, 13.000≤TL/(G12+T4)≤25.600;

(G34+T5)/T6≥1.500, and preferably, 1.500≤(G34+T5)/T6≤5.500;

(T4+G67)/G23≤4.500, and preferably, 1.100≤(T4+G67)/G23≤4.500.

In light of the unpredictability in an optical system, satisfying theseinequalities listed above may result in promoting the imaging quality,shortening the system length of the optical imaging lens, lowering thef-number, enlarging half field of view and/or increasing the yield inthe assembly process in the present disclosure.

When implementing example embodiments, more details about the convex orconcave surface or refracting power could be incorporated for onespecific lens element or broadly for a plurality of lens elements toimprove the control for the system volume, performance, resolution,and/or promote the yield. For example, in an example embodiment, eachlens element may be made from plastic to lighten the weight and lowerthe cost, and other transparent materials, such as glass, resin, etc.may be used too. It is noted that the details listed here could beincorporated in example embodiments if no inconsistency occurs.

Several example embodiments and associated optical data will now beprovided for illustrating example embodiments of an optical imaging lenswith good optical characteristics, a wide field of view and/or a lowf-number. Reference is now made to FIGS. 6-9. FIG. 6 illustrates anexample cross-sectional view of an optical imaging lens 1 having eightlens elements of the optical imaging lens according to a first exampleembodiment. FIGS. 7A-7D show example charts of a longitudinal sphericalaberration and other kinds of optical aberrations of the optical imaginglens 1 according to an example embodiment. FIG. 8 illustrates an exampletable of optical data of each lens element of the optical imaging lens 1according to an example embodiment. FIG. 9 depicts an example table ofaspherical data of the optical imaging lens 1 according to an exampleembodiment.

As shown in FIG. 6, the optical imaging lens 1 of the present embodimentmay comprise, in the order from an object side A1 to an image side A2along an optical axis, an aperture stop STO, a first lens element L1, asecond lens element L2, a third lens element L3, a fourth lens elementL4, a fifth lens element L5, a sixth lens element L6, a seventh lenselement L7 and an eighth lens element L8. A filtering unit TF and animage plane IMA of an image sensor may be positioned at the image sideA2 of the optical lens 1. The filtering unit TF, positioned between theeighth lens element L8 and the image plane IMA, may selectively absorblight with specific wavelength(s) from the light passing through opticalimaging lens 1. The example embodiment of the filtering unit TF whichmay selectively absorb light with specific wavelength(s) from the lightpassing through optical imaging lens 1 may be an IR cut filter (infraredcut filter). Then, IR light may be absorbed, and this may prohibit theIR light, which might not be seen by human eyes, from producing an imageon the image plane IMA.

Example embodiments of each lens element of the optical imaging lens 1,which may be constructed by glass, plastic, resin material or othertransparent material and is constructed by plastic material here forexample, will now be described with reference to the drawings.

An example embodiment of the first lens element L1 may have positiverefracting power, an object-side surface L1A1 facing an object-side A1and an image-side surface L1A2 facing an image-side A2. On theobject-side surface L1A1, an optical axis region L1A1C may be convex anda periphery region L1A1P may be convex. On the image-side surface L1A2,an optical axis region L1A2C may be concave and a periphery region L1A2Pmay be concave.

An example embodiment of the second lens element L2 may have negativerefracting power, an object-side surface L2A1 facing the object-side A1and an image-side surface L2A2 facing the image-side A2. On theobject-side surface L2A1, an optical axis region L2A1C may be convex anda periphery region L2A1P may be convex. On the image-side surface L2A2,an optical axis region L2A2C may be concave and a periphery region L2A2Pmay be concave.

An example embodiment of the third lens element L3 may have positiverefracting power, an object-side surface L3A1 facing the object-side A1and an image-side surface L3A2 facing the image-side A2. On theobject-side surface L3A1, an optical axis region L3A1C may be convex anda periphery region L3A1P may be convex. On the image-side surface L3A2,an optical axis region L3A2C may be concave and a periphery region L3A2Pmay be convex.

An example embodiment of the fourth lens element L4 may have positiverefracting power, an object-side surface L4A1 facing the object-side A1and an image-side surface L4A2 facing the image-side A2. On theobject-side surface L4A1, an optical axis region L4A1C may be concaveand a periphery region L4A1P may be concave. On the image-side surfaceL4A2, an optical axis region L4A2C may be convex and a periphery regionL4A2P may be convex.

An example embodiment of the fifth lens element L5 may have negativerefracting power, an object-side surface L5A1 facing the object-side A1and an image-side surface L5A2 facing the image-side A2. On theobject-side surface L5A1, an optical axis region L5A1C may be concaveand a periphery region L5A1P may be concave. On the image-side surfaceL5A2, an optical axis region L5A2C may be convex and a periphery regionL5A2P may be convex.

An example embodiment of the sixth lens element L6 may have positiverefracting power, an object-side surface L6A1 facing the object-side A1and an image-side surface L6A2 facing the image-side A2. On theobject-side surface L6A1, an optical axis region L6A1C may be convex anda periphery region L6A1P may be concave. On the image-side surface L6A2,an optical axis region L6A2C may be concave and a periphery region L6A2Pmay be convex.

An example embodiment of the seventh lens element L7 may have positiverefracting power, an object-side surface L7A1 facing the object-side A1and an image-side surface L7A2 facing the image-side A2. On theobject-side surface L7A1, an optical axis region L7A1C may be convex anda periphery region L7A1P may be concave. On the image-side surface L7A2,an optical axis region L7A2C may be convex and a periphery region L7A2Pmay be convex.

An example embodiment of the eighth lens element L8 may have negativerefracting power, an object-side surface L8A1 facing the object-side A1and an image-side surface L8A2 facing the image-side A2. On theobject-side surface L8A1, an optical axis region L8A1C may be concaveand a periphery region L8A1P may be concave. On the image-side surfaceL8A2, an optical axis region L8A2C may be concave and a periphery regionL8A2P may be convex.

In example embodiments, air gaps may exist between each pair of adjacentlens elements, as well as between the eighth lens element L8 and thefiltering unit TF, and the filtering unit TF and the image plane IMA ofthe image sensor. Please note, in other embodiments, any of theaforementioned air gaps may or may not exist. For example, profiles ofopposite surfaces of a pair of adjacent lens elements may align withand/or attach to each other, and in such situations, the air gap mightnot exist.

FIG. 8 depicts the optical characteristics of each lens elements in theoptical imaging lens 1 of the present embodiment. Please also refer toFIG. 42 for the values of V5+V6+V7, V5+V6, ImgH/(T3+T4), AAG/BFL,TTL/(T2+G45+G67), TL/T1, (T1+T2+T3+T4)/D78, (T5+T8)/G34, ImgH/(T5+G56),EFL/BFL, TTL/T8, (G67+T7+G78)/T1, D25/(T1+G12), ALT/AAG, ImgH/(T2+G45),(EFL+BFL)/(T5+G56), TL/(G12+T4), (G34+T5)/T6, (T4+G67)/G23,(EFL+ImgH)/ALT, (V6+V7)−(V2+V4), (V7+V8)−(V4+V6), |V6−V7|, V6−V2 andV7−V4 corresponding to the present embodiment.

The totaled 16 aspherical surfaces, including the object-side surfaceL1A1 and the image-side surface L1A2 of the first lens element L1, theobject-side surface L2A1 and the image-side surface L2A2 of the secondlens element L2, the object-side surface L3A1 and the image-side surfaceL3A2 of the third lens element L3, the object-side surface L4A1 and theimage-side surface L4A2 of the fourth lens element L4, the object-sidesurface L5A1 and the image-side surface L5A2 of the fifth lens elementL5, the object-side surface L6A1 and the image-side surface L6A2 of thesixth lens element L6, the object-side surface L7A1 and the image-sidesurface L7A2 of the seventh lens element L7 and the object-side surfaceL8A1 and the image-side surface L8A2 of the eighth lens element L8 mayall be defined by the following aspherical formula:

${Z(Y)} = {{\frac{Y^{2}}{R}/\left( {1 + \sqrt{1 - {\left( {1 + K} \right)\frac{Y^{2}}{R^{2}}}}} \right)} + {\sum\limits_{i = 1}^{n}{a_{i} \times Y^{i}}}}$

wherein, Y represents the perpendicular distance between the point ofthe aspherical surface and the optical axis; Z represents the depth ofthe aspherical surface (the perpendicular distance between the point ofthe aspherical surface at a distance Y from the optical axis and thetangent plane of the vertex on the optical axis of the asphericalsurface); R represents the radius of curvature of the surface of thelens element; K represents a conic constant; a_(i) represents anaspherical coefficient of i^(th) level. The values of other asphericalparameters are shown in FIG. 9.

Referring to FIG. 7A, a longitudinal spherical aberration of the opticalimaging lens in the present embodiment is shown in coordinates in whichthe horizontal axis represents the longitudinal spherical aberration andthe vertical axis represents field of view, and field curvatureaberration of the optical imaging lens in the present embodiment in thesagittal direction is shown in FIG. 7B, and field curvature aberrationof the optical imaging lens in the present embodiment in the tangentialdirection is shown in FIG. 7C, in which the horizontal axis representsfield curvature aberration, the vertical axis represents image height,and distortion aberration of the optical imaging lens in the presentembodiment is shown in FIG. 7D, in which the horizontal axis representspercentage and the vertical axis represents image height. The curves ofdifferent wavelengths (470 nm, 555 nm, 650 nm) may be close to eachother. This represents that off-axis light with respect to thesewavelengths may be focused around an image point. From the verticaldeviation of each curve shown therein, the offset of the off-axis lightrelative to the image point may be within −0.1˜0.02 mm. Therefore, thepresent embodiment may improve the longitudinal spherical aberrationwith respect to different wavelengths. For field curvature aberration inthe sagittal direction, the focus variation with respect to the threewavelengths in the whole field may fall within −0.1˜0 mm, for fieldcurvature aberration in the tangential direction, the focus variationwith respect to the three wavelengths in the whole field may fall within−0.1˜0.08 mm, and the variation of the distortion aberration may bewithin 0˜40%.

According to the values of the aberrations, it is shown that the opticalimaging lens 1 of the present embodiment, with system length as short as6.917 mm, Fno as small as 1.649 and image height as great as 5.800 mm,may be capable of providing good imaging quality.

Reference is now made to FIGS. 10-13. FIG. 10 illustrates an examplecross-sectional view of an optical imaging lens 2 having eight lenselements of the optical imaging lens according to a second exampleembodiment. FIGS. 11A-11D show example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 2 according to the second example embodiment. FIG.12 shows an example table of optical data of each lens element of theoptical imaging lens 2 according to the second example embodiment. FIG.13 shows an example table of aspherical data of the optical imaging lens2 according to the second example embodiment.

As shown in FIG. 10, the optical imaging lens 2 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the second embodiment and the first embodimentmay include the radius of curvature, thickness of each lens element, thevalue of each air gap, aspherical data, related optical parameters, suchas back focal length, and the configuration of the concave/convex shapeof the object-side surfaces L4A1, L5A1 and the image-side surfaces L3A2,L4A2; but the configuration of the concave/convex shape of surfaces,comprising the object-side surfaces L1A1, L2A1, L3A1, L6A1, L7A1 andL8A1 facing to the object side A1 and the image-side surfaces L1A2,L2A2, L5A2, L6A2, L7A2 and L8A2 facing to the image side A2, andpositive or negative configuration of the refracting power of each lenselement may be similar to those in the first embodiment. Here and in theembodiments hereinafter, for clearly showing the drawings of the presentembodiment, only the surface shapes which are different from that in thefirst embodiment may be labeled. Specifically, a periphery region L3A2Pof the image-side surface L3A2 of the third lens element L3 may beconcave, an optical axis region L4A1C of the object-side surface L4A1 ofthe fourth lens element L4 may be convex, an optical axis region L4A2Cof the image-side surface L4A2 of the fourth lens element L4 may beconcave, and a periphery region L5A1P of the object-side surface L5A1 ofthe fifth lens element L5 may be convex. Please refer to FIG. 12 for theoptical characteristics of each lens elements in the optical imaginglens 2 of the present embodiment, and please refer to FIG. 42 for thevalues of V5+V6+V7, V5+V6, ImgH/(T3+T4), AAG/BFL, TTL/(T2+G45+G67),TL/T1, (T1+T2+T3+T4)/D78, (T5+T8)/G34, ImgH/(T5+G56), EFL/BFL, TTL/T8,(G67+T7+G78)/T1, D25/(T1+G12), ALT/AAG, ImgH/(T2+G45),(EFL+BFL)/(T5+G56), TL/(G12+T4), (G34+T5)/T6, (T4+G67)/G23,(EFL+ImgH)/ALT, (V6+V7)−(V2+V4), (V7+V8)−(V4+V6), |V6−V7|, V6−V2 andV7−V4 of the present embodiment.

As the longitudinal spherical aberration shown in FIG. 11A, the offsetof the off-axis light relative to the image point may be within−0.08˜0.16 mm. As the field curvature aberration in the sagittaldirection shown in FIG. 11B, the focus variation with regard to thethree wavelengths in the whole field may fall within −0.08˜0.16 mm. Asthe field curvature aberration in the tangential direction shown in FIG.11C, the focus variation with regard to the three wavelengths in thewhole field may fall within −0.12˜0.16 mm. As shown in FIG. 11D, thevariation of the distortion aberration may be within −4˜12%. Comparedwith the first embodiment, the distortion aberration of the presentembodiment is smaller.

According to the values of the aberrations, it is shown that the opticalimaging lens 2 of the present embodiment, with system length as short as8.006 mm, Fno as small as 1.649 and image height as great as 6.700 mm,may be capable of providing good imaging quality.

Reference is now made to FIGS. 14-17. FIG. 14 illustrates an examplecross-sectional view of an optical imaging lens 3 having eight lenselements of the optical imaging lens according to a third exampleembodiment. FIGS. 15A-15D show example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 3 according to the third example embodiment. FIG.16 shows an example table of optical data of each lens element of theoptical imaging lens 3 according to the third example embodiment. FIG.17 shows an example table of aspherical data of the optical imaging lens3 according to the third example embodiment.

As shown in FIG. 14, the optical imaging lens 3 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the third embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data, related optical parameters,such as back focal length, the configuration of the object-side surfaceL4A1 and the image-side surfaces L3A2, L4A2, the negative refractingpower of the fourth lens element L4; but the configuration of theconcave/convex shape of surfaces, comprising the object-side surfacesL1A1, L2A1, L3A1, L5A1, L6A1, L7A1 and L8A1 facing to the object side A1and the image-side surfaces L1A2, L2A2, L5A2, L6A2, L7A2 and L8A2 facingto the image side A2, and positive or negative configuration of therefracting power of each lens element other than the fourth lens elementL4 may be similar to those in the first embodiment. Specifically, aperiphery region L3A2P of the image-side surface L3A2 of the third lenselement L3 may be concave, an optical axis region L4A1C of theobject-side surface L4A1 of the fourth lens element L4 may be convex,and an optical axis region L4A2C of the image-side surface L4A2 of thefourth lens element L4 may be concave. Please refer to FIG. 16 for theoptical characteristics of each lens elements in the optical imaginglens 3 of the present embodiment, and please refer to FIG. 42 for thevalues of V5+V6+V7, V5+V6, ImgH/(T3+T4), AAG/BFL, TTL/(T2+G45+G67),TL/T1, (T1+T2+T3+T4)/D78, (T5+T8)/G34, ImgH/(T5+G56), EFL/BFL, TTL/T8,(G67+T7+G78)/T1, D25/(T1+G12), ALT/AAG, ImgH/(T2+G45),(EFL+BFL)/(T5+G56), TL/(G12+T4), (G34+T5)/T6, (T4+G67)/G23,(EFL+ImgH)/ALT, (V6+V7)−(V2+V4), (V7+V8)−(V4+V6), |V6−V7|, V6−V2 andV7−V4 of the present embodiment.

As the longitudinal spherical aberration shown in FIG. 15A, the offsetof the off-axis light relative to the image point may be within−0.16˜0.04 mm. As the field curvature aberration in the sagittaldirection shown in FIG. 15B, the focus variation with regard to thethree wavelengths in the whole field may fall within −0.16˜0.04 mm. Asthe field curvature aberration in the tangential direction shown in FIG.15C, the focus variation with regard to the three wavelengths in thewhole field may fall within −0.12˜0.12 mm. As shown in FIG. 15D, thevariation of the distortion aberration may be within 0˜16%. Comparedwith the first embodiment, the distortion aberration may be smaller inthe present embodiment.

According to the values of the aberrations, it is shown that the opticalimaging lens 3 of the present embodiment, with system length as short as7.701 mm, Fno as small as 1.649 and image height as great as 6.700 mm,may be capable of providing good imaging quality.

Reference is now made to FIGS. 18-21. FIG. 18 illustrates an examplecross-sectional view of an optical imaging lens 4 having eight lenselements of the optical imaging lens according to a fourth exampleembodiment. FIGS. 19A-19D show example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 4 according to the fourth embodiment. FIG. 20 showsan example table of optical data of each lens element of the opticalimaging lens 4 according to the fourth example embodiment. FIG. 21 showsan example table of aspherical data of the optical imaging lens 4according to the fourth example embodiment.

As shown in FIG. 18, the optical imaging lens 4 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the fourth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data and related opticalparameters, such as back focal length, and the configuration of theconcave/convex shape of the object-side surfaces L3A1, L4A1 and theimage-side surfaces L3A2, L4A2; but the configuration of theconcave/convex shape of surfaces, comprising the object-side surfacesL1A1, L2A1, L5A1, L6A1, L7A1 and L8A1 facing to the object side A1 andthe image-side surfaces L1A2, L2A2, L5A2, L6A2, L7A2 and L8A2 facing tothe image side A2, and positive or negative configuration of therefracting power of each lens element may be similar to those in thefirst embodiment. Specifically, an optical axis region L3A1C of theobject-side surface L3A1 of the third lens element L3 may be concave, anoptical axis region L3A2C of the image-side surface L3A2 of the thirdlens element L3 may be convex, a periphery region L3A2P of theimage-side surface L3A2 of the third lens element L3 may be concave, anoptical axis region L4A1C of the object-side surface L4A1 of the fourthlens element L4 may be convex, an optical axis region L4A2C of theimage-side surface L4A2 of the fourth lens element L4 may be concave.Please refer to FIG. 20 for the optical characteristics of each lenselements in the optical imaging lens 4 of the present embodiment, pleaserefer to FIG. 42 for the values of V5+V6+V7, V5+V6, ImgH/(T3+T4),AAG/BFL, TTL/(T2+G45+G67), TL/T1, (T1+T2+T3+T4)/D78, (T5+T8)/G34,ImgH/(T5+G56), EFL/BFL, TTL/T8, (G67+T7+G78)/T1, D25/(T1+G12), ALT/AAG,ImgH/(T2+G45), (EFL+BFL)/(T5+G56), TL/(G12+T4), (G34+T5)/T6,(T4+G67)/G23, (EFL+ImgH)/ALT, (V6+V7)−(V2+V4), (V7+V8)−(V4+V6), |V6−V7|,V6−V2 and V7−V4 of the present embodiment.

As the longitudinal spherical aberration shown in FIG. 19A, the offsetof the off-axis light relative to the image point may be within−0.02˜0.03 mm. As the field curvature aberration in the sagittaldirection shown in FIG. 19B, the focus variation with regard to thethree wavelengths in the whole field may fall within −0.02˜0.03 mm. Asthe field curvature aberration in the tangential direction shown in FIG.19C, the focus variation with regard to the three wavelengths in thewhole field may fall within −0.02˜0.04 mm. As shown in FIG. 19D, thevariation of the distortion aberration may be within 0˜30%. Comparedwith the first embodiment, the longitudinal spherical aberration, thefield curvature aberration in both the sagittal and tangentialdirections and the distortion aberration may be smaller in the presentembodiment.

According to the values of the aberrations, it is shown that the opticalimaging lens 4 of the present embodiment, with system length as short as8.541 mm, Fno as small as 1.649 and image height as great as 6.700 mm,may be capable of providing good imaging quality.

Reference is now made to FIGS. 22-25. FIG. 22 illustrates an examplecross-sectional view of an optical imaging lens 5 having eight lenselements of the optical imaging lens according to a fifth exampleembodiment. FIGS. 23A-23D show example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 5 according to the fifth embodiment. FIG. 24 showsan example table of optical data of each lens element of the opticalimaging lens 5 according to the fifth example embodiment. FIG. 25 showsan example table of aspherical data of the optical imaging lens 5according to the fifth example embodiment.

As shown in FIG. 22, the optical imaging lens 5 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the fifth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data, related optical parameters,such as back focal length, and the configuration of the object-sidesurface L8A1; but the configuration of the concave/convex shape ofsurfaces, comprising the object-side surfaces L1A1, L2A1, L3A1, L4A1,L5A1, L6A1 and L7A1 facing to the object side A1 and the image-sidesurfaces L1A2, L2A2, L3A2, L4A2, L5A2, L6A2, L7A2 and L8A2 facing to theimage side A2, and positive or negative configuration of the refractingpower of each lens element may be similar to those in the firstembodiment. Specifically, a periphery region L8A1P of the object-sidesurface L8A1 of the eighth lens element L8 may be convex. Please referto FIG. 24 for the optical characteristics of each lens elements in theoptical imaging lens 5 of the present embodiment, please refer to FIG.42 for the values of V5+V6+V7, V5+V6, ImgH/(T3+T4), AAG/BFL,TTL/(T2+G45+G67), TL/T1, (T1+T2+T3+T4)/D78, (T5+T8)/G34, ImgH/(T5+G56),EFL/BFL, TTL/T8, (G67+T7+G78)/T1, D25/(T1+G12), ALT/AAG, ImgH/(T2+G45),(EFL+BFL)/(T5+G56), TL/(G12+T4), (G34+T5)/T6, (T4+G67)/G23,(EFL+ImgH)/ALT, (V6+V7)−(V2+V4), (V7+V8)−(V4+V6), |V6−V7|, V6−V2 andV7−V4 of the present embodiment.

As the longitudinal spherical aberration shown in FIG. 23A, the offsetof the off-axis light relative to the image point may be within−0.03˜0.04 mm. As the field curvature aberration in the sagittaldirection shown in FIG. 23B, the focus variation with regard to thethree wavelengths in the whole field may fall within −0.03˜0.04 mm. Asthe field curvature aberration in the tangential direction shown in FIG.23C, the focus variation with regard to the three wavelengths in thewhole field may fall within −0.03˜0.05 mm. As shown in FIG. 23D, thevariation of the distortion aberration may be within 0˜10%. Comparedwith the first embodiment, the longitudinal spherical aberration, thefield curvature aberration in both the sagittal and tangentialdirections and the distortion aberration may be smaller in the presentembodiment.

According to the values of the aberrations, it is shown that the opticalimaging lens 5 of the present embodiment, with system length as short as7.818 mm, Fno as small as 1.649 and image height as great as 5.800 mm,may be capable of providing good imaging quality.

Reference is now made to FIGS. 26-29. FIG. 26 illustrates an examplecross-sectional view of an optical imaging lens 6 having eight lenselements of the optical imaging lens according to a sixth exampleembodiment. FIGS. 27A-27D show example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 6 according to the sixth embodiment. FIG. 28 showsan example table of optical data of each lens element of the opticalimaging lens 6 according to the sixth example embodiment. FIG. 29 showsan example table of aspherical data of the optical imaging lens 6according to the sixth example embodiment.

As shown in FIG. 26, the optical imaging lens 6 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the sixth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data and related opticalparameters, such as back focal length, and the configuration of theconcave/convex shape of the object-side surface L8A1 and the image-sidesurfaces L1A2, L8A2; but the configuration of the concave/convex shapeof surfaces, comprising the object-side surfaces L1A1, L2A1, L3A1, L4A1,L5A1, L6A1 and L7A1 facing to the object side A1 and the image-sidesurfaces L2A2, L3A2, L4A2, L5A2, L6A2 and L7A2 facing to the image sideA2, and positive or negative configuration of the refracting power ofeach lens element may be similar to those in the first embodiment.Specifically, a periphery region L1A2P of the image-side surface L1A2 ofthe first lens element L1 may be convex, a periphery region L8A1P of theobject-side surface L8A1 of the eight lens element L8 may be convex, anda periphery region L8A2P of the image-side surface L8A2 of the eightlens element L8 may be concave. Please refer to FIG. 28 for the opticalcharacteristics of each lens elements in the optical imaging lens 6 ofthe present embodiment, please refer to FIG. 43 for the values ofV5+V6+V7, V5+V6, ImgH/(T3+T4), AAG/BFL, TTL/(T2+G45+G67), TL/T1,(T1+T2+T3+T4)/D78, (T5+T8)/G34, ImgH/(T5+G56), EFL/BFL, TTL/T8,(G67+T7+G78)/T1, D25/(T1+G12), ALT/AAG, ImgH/(T2+G45),(EFL+BFL)/(T5+G56), TL/(G12+T4), (G34+T5)/T6, (T4+G67)/G23,(EFL+ImgH)/ALT, (V6+V7)−(V2+V4), (V7+V8)−(V4+V6), |V6−V7|, V6−V2 andV7−V4 of the present embodiment.

As the longitudinal spherical aberration shown in FIG. 27A, the offsetof the off-axis light relative to the image point may be within−0.02˜0.03 mm. As the field curvature aberration in the sagittaldirection shown in FIG. 27B, the focus variation with regard to thethree wavelengths in the whole field may fall within −0.02˜0.03 mm. Asthe field curvature aberration in the tangential direction shown in FIG.27C, the focus variation with regard to the three wavelengths in thewhole field may fall within −0.02˜0.08 mm. As shown in FIG. 27D, thevariation of the distortion aberration may be within 0˜12%. Comparedwith the first embodiment, the longitudinal spherical aberration, thefield curvature aberration in both the sagittal and tangentialdirections and the distortion aberration may be smaller in the presentembodiment.

According to the values of the aberrations, it is shown that the opticalimaging lens 6 of the present embodiment, with system length as short as9.204 mm, Fno as small as 1.649 and image height as great as 5.800 mm,may be capable of providing good imaging quality.

Reference is now made to FIGS. 30-33. FIG. 30 illustrates an examplecross-sectional view of an optical imaging lens 7 having eight lenselements of the optical imaging lens according to a seventh exampleembodiment. FIGS. 31A-31D show example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 7 according to the seventh embodiment. FIG. 32shows an example table of optical data of each lens element of theoptical imaging lens 7 according to the seventh example embodiment. FIG.33 shows an example table of aspherical data of the optical imaging lens7 according to the seventh example embodiment.

As shown in FIG. 30, the optical imaging lens 7 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the seventh embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, and aspherical data, related opticalparameters, such as back focal length; but the configuration of theconcave/convex shape of surfaces, comprising the object-side surfacesL1A1, L2A1, L3A1, L4A1, L5A1, L6A1, L7A1 and L8A1 facing to the objectside A1 and the image-side surfaces L1A2, L2A2, L3A2, L4A2, L5A2, L6A2,L7A2 and L8A2 facing to the image side A2, and positive or negativeconfiguration of the refracting power of each lens element may besimilar to those in the first embodiment. Please refer to FIG. 32 forthe optical characteristics of each lens elements in the optical imaginglens 7 of the present embodiment, please refer to FIG. 43 for the valuesof V5+V6+V7, V5+V6, ImgH/(T3+T4), AAG/BFL, TTL/(T2+G45+G67), TL/T1,(T1+T2+T3+T4)/D78, (T5+T8)/G34, ImgH/(T5+G56), EFL/BFL, TTL/T8,(G67+T7+G78)/T1, D25/(T1+G12), ALT/AAG, ImgH/(T2+G45),(EFL+BFL)/(T5+G56), TL/(G12+T4), (G34+T5)/T6, (T4+G67)/G23,(EFL+ImgH)/ALT, (V6+V7)−(V2+V4), (V7+V8)−(V4+V6), |V6−V7|, V6−V2 andV7−V4 of the present embodiment.

As the longitudinal spherical aberration shown in FIG. 31A, the offsetof the off-axis light relative to the image point may be within−0.1˜0.02 mm. As the field curvature aberration in the sagittaldirection shown in FIG. 31B, the focus variation with regard to thethree wavelengths in the whole field may fall within −0.12˜0.04 mm. Asthe field curvature aberration in the tangential direction shown in FIG.31C, the focus variation with regard to the three wavelengths in thewhole field may fall within −0.12˜0.12 mm. As shown in FIG. 31D, thevariation of the distortion aberration may be within 0˜30%. Comparedwith the first embodiment, the distortion aberration may be smaller inthe present embodiment.

According to the values of the aberrations, it is shown that the opticalimaging lens 7 of the present embodiment, with system length as short as7.760 mm, Fno as small as 1.649 and image height as great as 5.800 mm,may be capable of providing good imaging quality.

Reference is now made to FIGS. 34-37. FIG. 34 illustrates an examplecross-sectional view of an optical imaging lens 8 having eight lenselements of the optical imaging lens according to an eighth exampleembodiment. FIGS. 35A-35D show example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 8 according to the eighth embodiment. FIG. 36 showsan example table of optical data of each lens element of the opticalimaging lens 8 according to the eighth example embodiment. FIG. 37 showsan example table of aspherical data of the optical imaging lens 8according to the eighth example embodiment.

As shown in FIG. 34, the optical imaging lens 8 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the eighth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data, related optical parameters,such as back focal length, and the configuration of the concave/convexshape of the object-side surface L8A1 and the image-side surface L1A2;but the configuration of the concave/convex shape of surfaces comprisingthe object-side surfaces L1A1, L2A1, L3A1, L4A1, L5A1, L6A1 and L7A1facing to the object side A1 and the image-side surfaces L2A2, L3A2,L4A2, L5A2, L6A2, L7A2 and L8A2 facing to the image side A2, andpositive or negative configuration of the refracting power of each lenselement may be similar to those in the first embodiment. Specifically, aperiphery region L1A2P of the image-side surface L1A2 of the first lenselement L1 may be convex, and a periphery region L8A1P of theobject-side surface L8A1 of the eighth lens element L8 may be convex.Please refer to FIG. 36 for the optical characteristics of each lenselements in the optical imaging lens 8 of the present embodiment, andplease refer to FIG. 43 for the values of V5+V6+V7, V5+V6, ImgH/(T3+T4),AAG/BFL, TTL/(T2+G45+G67), TL/T1, (T1+T2+T3+T4)/D78, (T5+T8)/G34,ImgH/(T5+G56), EFL/BFL, TTL/T8, (G67+T7+G78)/T1, D25/(T1+G12), ALT/AAG,ImgH/(T2+G45), (EFL+BFL)/(T5+G56), TL/(G12+T4), (G34+T5)/T6,(T4+G67)/G23, (EFL+ImgH)/ALT, (V6+V7)−(V2+V4), (V7+V8)−(V4+V6), |V6−V7|,V6−V2 and V7−V4 of the present embodiment.

As the longitudinal spherical aberration shown in FIG. 35A, the offsetof the off-axis light relative to the image point may be within−0.03˜0.03 mm. As the field curvature aberration in the sagittaldirection shown in FIG. 35B, the focus variation with regard to thethree wavelengths in the whole field may fall within −0.03˜0.03 mm. Asthe field curvature aberration in the tangential direction shown in FIG.35C, the focus variation with regard to the three wavelengths in thewhole field may fall within −0.03˜0.04 mm. As shown in FIG. 35D, thevariation of the distortion aberration may be within 0˜10%. Comparedwith the first embodiment, the longitudinal spherical aberration, thefield curvature aberration in both the sagittal and tangentialdirections and the distortion aberration may be smaller in the presentembodiment.

According to the values of the aberrations, it is shown that the opticalimaging lens 8 of the present embodiment, with system length as short as9.014 mm, Fno as small as 1.649 and image height as great as 5.800 mm,may be capable of providing good imaging quality.

Reference is now made to FIGS. 38-41. FIG. 38 illustrates an examplecross-sectional view of an optical imaging lens 9 having eight lenselements of the optical imaging lens according to a ninth exampleembodiment. FIGS. 39A-39D show example charts of a longitudinalspherical aberration and other kinds of optical aberrations of theoptical imaging lens 9 according to the ninth embodiment. FIG. 40 showsan example table of optical data of each lens element of the opticalimaging lens 9 according to the ninth example embodiment. FIG. 41 showsan example table of aspherical data of the optical imaging lens 9according to the ninth example embodiment.

As shown in FIG. 38, the optical imaging lens 9 of the presentembodiment, in an order from an object side A1 to an image side A2 alongan optical axis, may comprise an aperture stop STO, a first lens elementL1, a second lens element L2, a third lens element L3, a fourth lenselement L4, a fifth lens element L5, a sixth lens element L6, a seventhlens element L7 and an eighth lens element L8.

The differences between the ninth embodiment and the first embodimentmay include the radius of curvature and thickness of each lens element,the value of each air gap, aspherical data related optical parameters,such as back focal length, and but the configuration of theconcave/convex shape of the object-side surface L4A1 and the image-sidesurfaces L3A2, L4A2; but the configuration of the concave/convex shapeof surfaces comprising the object-side surfaces L1A1, L2A1, L3A1, L5A1,L6A1, L7A1 and L8A1 facing to the object side A1 and the image-sidesurfaces L1A2, L2A2, L5A2, L6A2, L7A2 and L8A2 facing to the image sideA2, and positive or negative configuration of the refracting power ofeach lens element may be similar to those in the first embodiment.Specifically, a periphery region L3A2P of the image-side surface L3A2 ofthe third lens element L3 may be concave, an optical axis region L4A1Cof the object-side surface L4A1 of the fourth lens element L4 may beconvex, and an optical axis region L4A2C of the image-side surface L4A2of the fourth lens element L4 may be concave. Please refer to FIG. 40for the optical characteristics of each lens elements in the opticalimaging lens 9 of the present embodiment, and please refer to FIG. 43for the values of V5+V6+V7, V5+V6, ImgH/(T3+T4), AAG/BFL,TTL/(T2+G45+G67), TL/T1, (T1+T2+T3+T4)/D78, (T5+T8)/G34, ImgH/(T5+G56),EFL/BFL, TTL/T8, (G67+T7+G78)/T1, D25/(T1+G12), ALT/AAG, ImgH/(T2+G45),(EFL+BFL)/(T5+G56), TL/(G12+T4), (G34+T5)/T6, (T4+G67)/G23,(EFL+ImgH)/ALT, (V6+V7)−(V2+V4), (V7+V8)−(V4+V6), |V6−V7|, V6−V2 andV7−V4 of the present embodiment.

As the longitudinal spherical aberration shown in FIG. 39A, the offsetof the off-axis light relative to the image point may be within−0.02˜0.04 mm. As the field curvature aberration in the sagittaldirection shown in FIG. 39B, the focus variation with regard to thethree wavelengths in the whole field may fall within −0.02˜0.04 mm. Asthe field curvature aberration in the tangential direction shown in FIG.39C, the focus variation with regard to the three wavelengths in thewhole field may fall within −0.03˜0.05 mm. As shown in FIG. 39D, thevariation of the distortion aberration may be within 0˜20%. Comparedwith the first embodiment, the longitudinal spherical aberration, thefield curvature aberration in both the sagittal and tangentialdirections and the distortion aberration may be smaller in the presentembodiment.

According to the values of the aberrations, it is shown that the opticalimaging lens 9 of the present embodiment, with system length as short as8.347 mm, Fno as small as 1.649 and image height as great as 6.700 mm,may be capable of providing good imaging quality.

Please refer to FIGS. 42 and 43 for the values of V5+V6+V7, V5+V6,ImgH/(T3+T4), AAG/BFL, TTL/(T2+G45+G67), TL/T1, (T1+T2+T3+T4)/D78,(T5+T8)/G34, ImgH/(T5+G56), EFL/BFL, TTL/T8, (G67+T7+G78)/T1,D25/(T1+G12), ALT/AAG, ImgH/(T2+G45), (EFL+BFL)/(T5+G56), TL/(G12+T4),(G34+T5)/T6, (T4+G67)/G23, (EFL+ImgH)/ALT, (V6+V7)−(V2+V4),(V7+V8)−(V4+V6), |V6−V7|, V6−V2 and V7−V4 of all eleven embodiments, andthe optical imaging lens of the present disclosure may satisfyInequalities (1), (2) and/or at least one of Inequalities (3)˜(25).

According to above illustration, the longitudinal spherical aberration,field curvature in both the sagittal direction and tangential directionand distortion aberration in all embodiments may meet the userrequirement of a related product in the market. The off-axis light withregard to three different wavelengths (470 nm, 555 nm, 650 nm) may befocused around an image point and the offset of the off-axis lightrelative to the image point may be well controlled with suppression forthe longitudinal spherical aberration, field curvature both in thesagittal direction and tangential direction and distortion aberration.The curves of different wavelengths may be close to each other, and thisrepresents that the focusing for light having different wavelengths maybe good to suppress chromatic dispersion. In summary, lens elements aredesigned and matched for achieving good imaging quality.

The contents in the embodiments of the invention include but are notlimited to a focal length, a thickness of a lens element, an Abbenumber, or other optical parameters. For example, in the embodiments ofthe invention, an optical parameter A and an optical parameter B aredisclosed, wherein the ranges of the optical parameters, comparativerelation between the optical parameters, and the range of a conditionalexpression covered by a plurality of embodiments are specificallyexplained as follows:

(1) The ranges of the optical parameters are, for example, α₂≤A≤α₁ orβ₂≤B≤β₁, where α₁ is a maximum value of the optical parameter A amongthe plurality of embodiments, α₂ is a minimum value of the opticalparameter A among the plurality of embodiments, β₁ is a maximum value ofthe optical parameter B among the plurality of embodiments, and β₂ is aminimum value of the optical parameter B among the plurality ofembodiments.

(2) The comparative relation between the optical parameters is that A isgreater than B or A is less than B, for example.

(3) The range of a conditional expression covered by a plurality ofembodiments is in detail a combination relation or proportional relationobtained by a possible operation of a plurality of optical parameters ineach same embodiment. The relation is defined as E, and E is, forexample, A+B or A−B or A/B or A*B or (A*B)^(1/2), and E satisfies aconditional expression E≤γ₁ or E≥γ₂ or γ₂≤E≤γ₁, where each of γ₁ and γ₂is a value obtained by an operation of the optical parameter A and theoptical parameter B in a same embodiment, γ₁ is a maximum value amongthe plurality of the embodiments, and γ₂ is a minimum value among theplurality of the embodiments.

The ranges of the aforementioned optical parameters, the aforementionedcomparative relations between the optical parameters, and a maximumvalue, a minimum value, and the numerical range between the maximumvalue and the minimum value of the aforementioned conditionalexpressions are all implementable and all belong to the scope disclosedby the invention. The aforementioned description is for exemplaryexplanation, but the invention is not limited thereto.

The embodiments of the invention are all implementable. In addition, acombination of partial features in a same embodiment can be selected,and the combination of partial features can achieve the unexpectedresult of the invention with respect to the prior art. The combinationof partial features includes but is not limited to the surface shape ofa lens element, a refracting power, a conditional expression or thelike, or a combination thereof. The description of the embodiments isfor explaining the specific embodiments of the principles of theinvention, but the invention is not limited thereto. Specifically, theembodiments and the drawings are for exemplifying, but the invention isnot limited thereto.

Additionally, the section headings herein are provided for consistencywith the suggestions under 37 C.F.R. 1.77 or otherwise to provideorganizational cues. These headings shall not limit or characterize theinvention(s) set out in any claims that may issue from this disclosure.Specifically, a description of a technology in the “Background” is notto be construed as an admission that technology is prior art to anyinvention(s) in this disclosure. Furthermore, any reference in thisdisclosure to “invention” in the singular should not be used to arguethat there is only a single point of novelty in this disclosure.Multiple inventions may be set forth according to the limitations of themultiple claims issuing from this disclosure, and such claimsaccordingly define the invention(s), and their equivalents, that areprotected thereby. In all instances, the scope of such claims shall beconsidered on their own merits in light of this disclosure, but shouldnot be constrained by the headings herein.

What is claimed is:
 1. An optical imaging lens, comprising a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement and an eighth lens element sequentially from an object side toan image side along an optical axis, each of the first, second, third,fourth, fifth, sixth, seventh and eighth lens element having anobject-side surface facing toward the object side and allowing imagingrays to pass through and an image-side surface facing toward the imageside and allowing the imaging rays to pass through, wherein: the firstlens element has positive refracting power; the fifth lens element hasnegative refracting power, and an optical axis region of the image-sidesurface of the fifth lens element is convex; the sixth lens element haspositive refracting power; lens elements included by the optical imaginglens are only the eight lens elements described above; and an abbenumber of the fifth lens element is represented by V5, an abbe number ofthe sixth lens element is represented by V6, an abbe number of theseventh lens element is represented by V7, and the optical imaging lenssatisfies the inequality:V5+V6+V7≥155.000.
 2. The optical imaging lens according to claim 1,wherein an image height of the optical imaging lens is represented byImgH, a thickness of the third lens element along the optical axis isrepresented by T3, a thickness of the fourth lens element along theoptical axis is represented by T4, and ImgH, T3 and T4 satisfy theinequality:ImgH/(T3+T4)≥7.500.
 3. The optical imaging lens according to claim 1,wherein a sum of seven air gaps from the first lens element to theeighth lens element along the optical axis is represented by AAG, adistance from the image-side surface of the eighth lens element to animage plane along the optical axis is represented by BFL, and AAG andBFL satisfy the inequality:AAG/BFL≥1.800.
 4. The optical imaging lens according to claim 1, whereina distance from the object-side surface of the first lens element to animage plane along the optical axis is represented by TTL, a thickness ofthe second lens element along the optical axis is represented by T2, adistance from the image-side surface of the fourth lens element to theobject-side surface of the fifth lens element along the optical axis isrepresented by G45, a distance from the image-side surface of the sixthlens element to the object-side surface of the seventh lens elementalong the optical axis is represented by G67, and TTL, T2, G45 and G67satisfy the inequality:TTL/(T2+G45+G67)≥7.200.
 5. The optical imaging lens according to claim1, wherein a distance from the object-side surface of the first lenselement to the image-side surface of the eighth lens element along theoptical axis is represented by TL, a thickness of the first lens elementalong the optical axis is represented by T1, and TL and T1 satisfy theinequality:TL/T1≤13.000.
 6. The optical imaging lens according to claim 1, whereina thickness of the first lens element along the optical axis isrepresented by T1, a thickness of the second lens element along theoptical axis is represented by T2, a thickness of the third lens elementalong the optical axis is represented by T3, a thickness of the fourthlens element along the optical axis is represented by T4, a distancefrom the object-side surface of the seventh lens element to theimage-side surface of the eighth lens element along the optical axis isrepresented by D78, and T1, T2, T3, T4 and D78 satisfy the inequality:(T1+T2+T3+T4)/D78≤1.000.
 7. The optical imaging lens according to claim1, wherein a thickness of the fifth lens element along the optical axisis represented by T5, a thickness of the eight lens element along theoptical axis is represented by T8, a distance from the image-sidesurface of the third lens element to the object-side surface of thefourth lens element along the optical axis is represented by G34, andT5, T8 and G34 satisfy the inequality:(T5+T8)/G34≤5.600.
 8. An optical imaging lens, comprising a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement and an eighth lens element sequentially from an object side toan image side along an optical axis, each of the first, second, third,fourth, fifth, sixth, seventh and eighth lens element having anobject-side surface facing toward the object side and allowing imagingrays to pass through and an image-side surface facing toward the imageside and allowing the imaging rays to pass through, wherein: the firstlens element has positive refracting power; a periphery region of theobject-side surface of the second lens element is convex; the fifth lenselement has negative refracting power; the sixth lens element haspositive refracting power; an optical axis region of the object-sidesurface of the seventh lens element is convex; lens elements included bythe optical imaging lens are only the eight lens elements describedabove; and an abbe number of the fifth lens element is represented byV5, an abbe number of the sixth lens element is represented by V6, anabbe number of the seventh lens element is represented by V7, and theoptical imaging lens satisfies the inequality:V5+V6+V7≥155.000.
 9. The optical imaging lens according to claim 8,wherein an image height of the optical imaging lens is represented byImgH, a thickness of the fifth lens element along the optical axis isrepresented by T5, a distance from the image-side surface of the fifthlens element to the object-side surface of the sixth lens element alongthe optical axis is represented by G56, and ImgH, T5 and G56 satisfy theinequality:ImgH/(T5+G56)≥26.700.
 10. The optical imaging lens according to claim 8,wherein an effective focal length of the optical imaging lens isrepresented by EFL, a distance from the image-side surface of the eighthlens element to an image plane along the optical axis is represented byBFL, and EFL and BFL satisfy the inequality:EFL/BFL≥5.300.
 11. The optical imaging lens according to claim 8,wherein a distance from the object-side surface of the first lenselement to an image plane along the optical axis is represented by TTL,a thickness of the eighth lens element along the optical axis isrepresented by T8, and TTL and T8 satisfy the inequality:TTL/T8≤18.000.
 12. The optical imaging lens according to claim 8,wherein a distance from the image-side surface of the sixth lens elementto the object-side surface of the seventh lens element along the opticalaxis is represented by G67, a thickness of the seventh lens elementalong the optical axis is represented by T7, a distance from theimage-side surface of the seventh lens element to the object-sidesurface of the eighth lens element along the optical axis is representedby G78, a thickness of the first lens element along the optical axis isrepresented by T1, and G67, T7, G78 and T1 satisfy the inequality:(G67+T7+G78)/T1≤4.100.
 13. The optical imaging lens according to claim8, wherein a distance from the object-side surface of the second lenselement to the image-side surface of the fifth lens element along theoptical axis is represented by D25, a thickness of the first lenselement along the optical axis is represented by T1, a distance from theimage-side surface of the first lens element to the object-side surfaceof the second lens element along the optical axis is represented by G12,and D25, T1 and G12 satisfy the inequality:D25/(T1+G12)≤5.000.
 14. The optical imaging lens according to claim 8,wherein a sum of the thicknesses of all eight lens elements from thefirst lens element to the eighth lens element along the optical axis isrepresented by ALT, a sum of seven air gaps from the first lens elementto the eighth lens element along the optical axis is represented by AAG,and ALT and AAG satisfy the inequality:ALT/AAG≤1.900.
 15. An optical imaging lens, comprising a first lenselement, a second lens element, a third lens element, a fourth lenselement, a fifth lens element, a sixth lens element, a seventh lenselement and an eighth lens element sequentially from an object side toan image side along an optical axis, each of the first, second, third,fourth, fifth, sixth, seventh and eighth lens element having anobject-side surface facing toward the object side and allowing imagingrays to pass through and an image-side surface facing toward the imageside and allowing the imaging rays to pass through, wherein: the thirdlens element has positive refracting power; the fifth lens element hasnegative refracting power; the sixth lens element has positiverefracting power, and an optical axis region of the image-side surfaceof the sixth lens element is concave; an optical axis region of theobject-side surface of the seventh lens element is convex; lens elementsincluded by the optical imaging lens are only the eight lens elementsdescribed above; and an abbe number of the fifth lens element isrepresented by V5, an abbe number of the sixth lens element isrepresented by V6, and the optical imaging lens satisfies theinequality:V5+V6≥85.000.
 16. The optical imaging lens according to claim 15,wherein an image height of the optical imaging lens is represented byImgH, a thickness of the second lens element along the optical axis isrepresented by T2, a distance from the image-side surface of the fourthlens element to the object-side surface of the fifth lens element alongthe optical axis is represented by G45, and ImgH, T2 and G45 satisfy theinequality:ImgH/(T2+G45)≥10.000.
 17. The optical imaging lens according to claim15, wherein an effective focal length of the optical imaging lens isrepresented by EFL, a distance from the image-side surface of the eighthlens element to an image plane along the optical axis is represented byBFL, a thickness of the fifth lens element along the optical axis isrepresented by T5, a distance from the image-side surface of the fifthlens element to the object-side surface of the sixth lens element alongthe optical axis is represented by G56, and EFL, BFL, T5 and G56 satisfythe inequality:(EFL+BFL)/(T5+G56)≤11.400.
 18. The optical imaging lens according toclaim 15, wherein a distance from the object-side surface of the firstlens element to the image-side surface of the eighth lens element alongthe optical axis is represented by TL, a distance from the image-sidesurface of the first lens element to the object-side surface of thesecond lens element along the optical axis is represented by G12, athickness of the fourth lens element along the optical axis isrepresented by T4, and TL, G12 and T4 satisfy the inequality:TL/(G12+T4)≥13.000.
 19. The optical imaging lens according to claim 15,wherein a distance from the image-side surface of the third lens elementto the object-side surface of the fourth lens element along the opticalaxis is represented by G34, a thickness of the fifth lens element alongthe optical axis is represented by T5, a thickness of the sixth lenselement along the optical axis is represented by T6, and G34, T5 and T6satisfy the inequality:(G34+T5)/T6≥1.500.
 20. The optical imaging lens according to claim 15,wherein a thickness of the fourth lens element along the optical axis isrepresented by T4, a distance from the image-side surface of the sixthlens element to the object-side surface of the seventh lens elementalong the optical axis is represented by G67, a distance from theimage-side surface of the second lens element to the object-side surfaceof the third lens element along the optical axis is represented by G23,and T4, G67 and G23 satisfy the inequality:(T4+G67)/G23≤4.500.